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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfe12911fa849ce8a9a74ec5b4472bf8dca3587bd7b9f143c9833074dd02f1ae' 
  AND token = 'cBH/ERnQSysymFAVPIntI9NVq+CSMS9g9e+axRbM/qw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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