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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35907538e985aa38978101ff25a74c1e757ebb7bf32e79e5bf342c5eee51593c' 
  AND token = '3IgOsmSkC5/QZhA3MsgbCH6tFJJZo4ROjQ4UrAzns+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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