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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86fa19818051655d9235c8e1309e309db23ffd47cbad2a4a0b8419f8705b9fb1' 
  AND token = 'GjdZI5j8WK8cXsahA179++RlF4ILOx4Sbjs2W179rks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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