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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b31ae137fce91108697d92f96c9f3d13dd9598453b88a4300880264168977786' 
  AND token = 'Ou/CU4Pm/eep6JM+zN7QXTkJDux1pD+GQtOk1bUYWh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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