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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae2033f2fc680d6fe17485e3367ac1a12a7515f2a9bcdab80836e2a8b600535d' 
  AND token = 'hKTiIChXcx9YkkBBfJXj8hrURW5Krg4hrVelc6HXbZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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