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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6960627676fd3daacba12c22bd0e7dece7b466687929791e1a341507d797f061' 
  AND token = 'xld5pB5ZStXDK/diDuBFJZncSdcRD82UUHlNVCSpnDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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