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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '539b3bf20f29fd475937a3219f55836b0f0957c60858ffede3c85f0d9ab65eb2' 
  AND token = 'hpKjaZABNOmIf2cKZxCdMQ2l7Z5kNLrSM+4txyqi45k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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