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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a90848dcf788ea1d4b021c08da590bf363a049580978ff745f0f8d0a05ec0bdb' 
  AND token = 'XVXHGtBYRpKjAWy3mrQ7vezcx671WazRK7utQEcdcLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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