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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34efb141c176dd81df6532c02545f26371affd8eb7f0cd93616259d6d7e13bf9' 
  AND token = 'HJYYvJ9/5tsuWH/wdYHC92aji9REblUOkM8gFMu/3NM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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