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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '325e8b2e86f629a5b5b63606ee9a7ff89d5345f43708b543f5a6ef357dcad3cb' 
  AND token = 'G2GmFRKyR0BvJAMBoBygNfVtkkmQXlza2Bgdm8K6rBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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