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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ce58e93b784d268e4793b4ff6414873e22c4f7dcfc6d8feb9c590b8c40ecc62' 
  AND token = 'oYHEkKwK6JR2LSmWMBHxoSN6R6PO4sDAtEaHQvvK/aE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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