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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a211107c0258fa328de341ef94cf9d11f76aca91390a460a38fae64840cedce2' 
  AND token = 'BGStZwkM8S3+GfzV5OL83dAdJFer4cSRSF95sfT3IVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00103

JSON explain

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