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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b887520ae6d713625b0604c492d8f44b1433892add2bb52100ed5fa35dde421f' 
  AND token = 'Tkg19H51e8nWod8o0+ezNv1pIJ5l+Ij0oPBoV8hm7rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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