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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee25f7df631057c356f01229eed7443ceff6a8603598aecd83cc9c005f0df100' 
  AND token = 'RfMcale4Y8BiRdglvFdPEqTlYmgPn3pxiQ23l0VX71I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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