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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd9d783791a5270fda77e6d4c0756a83b7c8335c170acb019adeb52357f1b1b6' 
  AND token = 'UYQka6VSViWmrY/Iq5rEIHnjQ3nIu4UUKpOjoiPc+nU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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