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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dc72d903e55ff6e529938e8977573d46853036039eb61f858b01c81760c64f3' 
  AND token = 'p0SbjEXWhLIoFA+nrKYwsXixCRMuM9FvaM603aVo4Mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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