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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3bcad56323fb00fa35832626fab7e3091dffcac4a93ad117fb92fc43357fb3a' 
  AND token = 'SHktKhxu976+P8+sww8MpaPPLa5vGryJP//M6eDXlJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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