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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88f1b0dcc2b8cf11ce5e738ffba48de56462f104f86b0104d83963986f3fb686' 
  AND token = '7m1iFGoAcXBx/dgI74cnPz0CaHfk64KmyWlRQr1F4qY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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