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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2837c87dd9e910fb948f2c2d12ea8e17b2fde1de71e1d7151e6e1fcd3b49bc20' 
  AND token = '+jZA8cadvEnc/y/4vUekTdhdH9y4MtJBY2c3fpJG5WQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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