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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71d3a96e87f5407fc66e600157ac784086f89838dd5be6226e722e3dc41afb8c' 
  AND token = 'NNU9hEb5SuvoczbA9bSp//Umm/rkA9kA7tq6m9xUeug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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