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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28a270b458ec34cb149b48d7bf8931239f792f22d06fbf164a1f68baeb276705' 
  AND token = 'yPy+pr0hPiU7E/e8V0DMd5a9LiG9SQgEsoWDLudUHKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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