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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b4ddf7cad20d54523a05635fec45596faf9ca2c29134a9cfb37723c7be561bf' 
  AND token = 'vbIDeLgsrnduuwDBs4Zy2Yfk5RUE30Nkhz91OtKA2tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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