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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25cc270190aea5450bbfd4c76b24ededb1bc2d40175c3f075bf8e2a9d57021eb' 
  AND token = 'QrXry4tmBDwRJoaOX4Dc9IKtHao3ufi2GemkWWNJsTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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