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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aff2809036251329a53c77807abde8aea5e3a39915665e9511863a3d03897055' 
  AND token = '0SgU7a6V13Qg5V18XsfGmbnHfztQz3Gw8N3BF21C46k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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