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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc2a19a75adcfa3fa2f1a8fa92646113c4826078a78fab73e1d48548cde1f3e7' 
  AND token = 'ooZj1OrQgKMsLdy9dMHYz953yVl36UACiVnZC3cUwSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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