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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3b064703735cd8f334e3c70b34329921093c19c639be3da27b34c4b2e37f89b' 
  AND token = 'LVqPpV1Lo9A1vEBwh4o6TwGMNqjQmMQnbVT0tSVhLE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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