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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1580a9da31742075d599c1c02de257b312cf4b9c84200505b999fae01765d0c' 
  AND token = 'K7p/ogD7N4Sl0raPV3TFfEmrrD2blQd4j0PGzOfODEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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