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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba4679a03f5fb630f6c648032ccb7ee9e761932cdf73bd8d2e3e81a01ff83a8e' 
  AND token = '+A96z0OqJM7Mb2RXl3CTQBZbfhat5F7xKOndIGFphX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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