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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '398d885bc47de27a4cbb270d05c9f06dd39da2173944573620890d0aad6b35f1' 
  AND token = 'QPpFJiXxVIT/UJej4ujphi9T6BcpRdhErwC2LyAPtDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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