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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca04c27f992aa3e1a79b3ccb3ee9599c193c924ab4d7bc35a70136367cc586ec' 
  AND token = 'hGJG7nb3/ZZGc5D+jjPkpdGT3K39bInoXRajjKzGoGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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