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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa92c98cb4a377b828300c5eca0b074d696d7739def840f61f3b824737084e81' 
  AND token = 'AgjJRsMDCZDF1ucIb4BnWXWTUfDf8nANfZScLy93Dqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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