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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bc6f5051f46f5cee5a8fc5a982225b70e051bb2deccdb2498da054110c976b6' 
  AND token = 'DzEAUesnc3E4gEft96IGBzMl/7pD1thtQsSP1Wy4WmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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