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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4cc976e11204ebab7d933b5c5d8a7707bd5b197e83f6f513202a75b474003a9' 
  AND token = 'DUPE8ngbxWgUg5i17c/GA96S2DsDcECDZUaQ3BXZY+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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