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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26a1f80f2a29211c405fa5668d274f2ee3569f645254c9bf07481093a9920f98' 
  AND token = 'sTSbK1KGEd15HETWEwWlN2+5ZqxV69AzIIcZA1MfdLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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