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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7220797e2dbcca29e2189cedf0b1f7a68d0b351873c4d5484241caee4e47aa6' 
  AND token = 'HRpOkLA5HdZuD2C28SM6DWRTwkFuYMBtn2o8RFhlx78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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