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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27cfb5170acae1cacac202377b16851bf94c7a28c785fca69580142d52f694b7' 
  AND token = 'GBNi0R+0FI3xLQJCngWa76lOKNnhHMT22BVyRu5Kjvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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