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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a82b3786ede9e16de10dadc737281cc680da84719ac22d0a91c66c5267fc80a8' 
  AND token = 'REZaskGUaZ2QotS+If51mh7RMEOPDUlft5oYJ9oevHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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