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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19417892e27033094dce4b7872dcf1d58caf7e65cf9c4996c8337426db985547' 
  AND token = '2fFYT7HcsvJZHfP1cX3eQW3GyNDo+3IAJmrpJeKwdsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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