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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daef122e59416cecb9ae00252646b8da4c38cecffe06c0f20e0db4d84c1806a4' 
  AND token = 'l10gywT4yy4TA96nu06Pd0TXmjzLQG6RS+6NFoQrO4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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