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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee2fb4f69348037717d973703263bddf823376e34784e05313bc72dc12628f5b' 
  AND token = 'TygHOOL7h9+LOXsgUSUJ2xZxnKkMXZ/EzjUN+8AZ5OQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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