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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c01f5c43de9ddc5f0d81b3acaf81032779eeec35fcb604d75c743bee83a0261' 
  AND token = 'i0kAL1XylmRJba7zIFs8I2+aTeGSN+WFOV96FuYnfS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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