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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aec0b7972d75de76c5f2dd254849570e40be6933db140d7f399ba051561a9ec9' 
  AND token = '5PTHB3ppS3PEklEIPcjU/bVfI3M/I3aYKxXg8eJvNp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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