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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6abb68b3d113bdff73345914a351c0ef9cc027325aaf0a7e8697933e3a3692d' 
  AND token = 'lEML3hvQey8Xrnje7nL5DximIclEVn631fLg+fjl5/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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