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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a193d1bc95753f65ec38d57f1119bcea787983ec0a07eebe34569564ac85b37' 
  AND token = 'hH3ioOWkXD6j2+tXdVh2I+Jc3ZQe0cK9yvGhUgvcf44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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