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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84e1f016b6f490a551e011aee92875e3ee64563a2a9ff0ddde0433d60b239d25' 
  AND token = 'LKCZYMa4aWBk4UsTzLLnBJ0tG8eC3Cmu1x6MPjPX/es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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