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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9d732e9293432c0d9421e57404d7ac4271e0352a75f6b22566ace22e2ec9115' 
  AND token = 'ssvp4ul63JUGkisUYJi2eyiG7+bzgGyv7sEGYZUF7Ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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