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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee856a4a8fe798ff2c3a61d4ba11b7ad7b7686eefc0a5b1f4f0af92d49203031' 
  AND token = 'Bq+kbq7h8yieYSSz0JUgZ8lyhX1SxY+AffDjqkdWYWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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