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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b232f0aab325f2ac73f396c9d15bcc028dad6fb6ac95e931aee07eda0ba3a32' 
  AND token = '950xe2L63lSNUG5UP/khgPHbIig/eky2CzMtrKgNw+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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