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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ad1aff46619f7270505599b1710b46e875562f3771caa14e7133d9521493ae0' 
  AND token = 'vmnudMv0Ibbiv8Jvkv7kybneulKGJmgH4J067mypBAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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