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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27e2d17bf213d36a2e7baf1c219e7df2099d64637d6cce6f1a0c91957600c51e' 
  AND token = 'tUtZ56LqV9bKtFRYPKZvTYkOqK1q7Ry0F+mQnVQpNew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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