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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85193e4fab8de128a7988f72a3c618867b3be1af3e0c430c42dc83a3ec44b8a9' 
  AND token = 'N8mSD94n0ffSGqQNdtCY/i0/ovfyVwdetNDDRzoXePo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}