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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c708cf26c0cf2700b2a3d2940884fd25ef3bbb878c017742ebac37dc88d03884' 
  AND token = '2S5J2a/Wsm2IyKYd2fjuL6nW7EwrfXhTDf5U5dFzeyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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