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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '221e52ce54e20127c1c10a8ea6ad42dd3267aa27176fbcdbb211dfd998d49c81' 
  AND token = 'T6dkduZEGMF7oFAA+JQpu9ky4ePrLRH82yGu7ZsTgbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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